would可以表达过去习惯做类似于used to do
例句:
1. When we were children, we would go swimming every summer in that river.
表示请求,固定的句型:Will/Would you please do? / Would you like to do?
例句:Will/Would you please give him a message when you see him ?
shall
1. 用于第一,三人称,表示请求;建议 或推荐
例句:
1. Shall we start the meeting now?
2. Shall I watch TV now ?
3. Shall my son carry the case for you ?
2. 用于第二人称,表示命令,要求,许诺
例句:
1. You shall take whatever you like.
2. You shall not go to the party with me if you make so much noise again.
在表示推测的否定句或疑问句中,常用can /cant /could / couldnt表示,意思是:可能吗?;不可能。而不能使用mustnt或must等词。
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